gh-116145: Updated bundled Tcl/Tk on Windows to 8.6.14

[zooba]

• Issue: Update installers to Tcl/Tk 8.6.14 #116145

[terryjreedy]

@chrstphrchvz knows about tcl/tk changes.
@serhiy-storchaka is tkinter/ttk code and test maintainer.

Windows x86 test https://github.com/python/cpython/actions/runs/8349119889/job/22852588108?pr=117030

*** test tkinter 2 failures: lines 2001-2061
condensed failure:

FAIL: test_itemconfigure (test.test_tkinter.test_widgets.ListboxTest.test_itemconfigure)
  File "D:\a\cpython\cpython\Lib\test\test_tkinter\test_widgets.py", line 1002, in test_itemconfigure
    self.assertEqual(widget.itemconfigure(0, 'background'),
AssertionError: Tuples differ: ('background', '', '', '', 'red') != ('background', 'background', 'Background', '', 'red')

FAIL: test_configure_tabs (test.test_tkinter.test_widgets.TextTest.test_configure_tabs)
  File "D:\a\cpython\cpython\Lib\test\test_tkinter\test_widgets.py", line 662, in test_configure_tabs
    self.checkParam(widget, 'tabs', '10.2 20.7 1i 2i',
AssertionError: Tuples differ: (10.2, 20.7, <string object: '1i'>, <string object: '2i'>) != ('10.2', '20.7', '1i', '2i')

*** test audit 1 failure, lines 980-1070: Broken pipe error
I know nothing about this. It passed on rerun, same fail, OK on x64, no failure on free-threading builds.
Perhaps ignore for now.

*** test_ttk failed (8 failures) lines 2066-2265
All are same quoting issue: actual (0,) expected as ('0',).